<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title>用arguments获取传递的实参</title>
	</head>
	<body>
		
		<div id="div1" style="width: 200px;background:red ;height:200px ;" ></div>
		
		<script>
			
			window.onload=function() {
				var div1=document.getElementById("div1");
				alert(css(div1,'width'));
				css(div1,'background','green');
			}
			
			/*function css () {
				if (arguments.length==2) {
				return arguments[0].style[arguments[1]];
				} else if(arguments.length==3){
					arguments[0].style[arguments[1]]=arguments[2];
				}else{
					alert("no")
				}
			}*/
			
				function css (obj,name,value) {
				if (arguments.length==2) {
					return obj.style[name];
				} else{
					obj.style[name]=value;
				}
			}
				
		</script>
	</body>
</html>
